匂い
におい · nioi · JLPT N4 · noun
olfactory property
👃 nioi: your knee (ni) oy! — a smell that makes you say oy
Sounds like knee-oy: a whiff so strong you blurt out oy. 匂い is the neutral-to-pleasant word for a smell; the related 臭い (same reading, nioi) is used for bad odors.